I'm cool with it. I'd probably still prefer females, but to be honest, I don't really care what my own gender is. It would be interesting to see what being a female is like, even if its not the same species.
Thinking about it more, this would actually be a preferable situation. The stallions are cute enough, but its the females that really stand out within the show for cuteness. If I'm going to be a pony I want to be bucking adorable.